Ventriduct

To obtain the white blood-corpuscles, pith a Necturus. To do this […] ventriduct the head, and press the thumb nail quite firmly against the dorsal side nearly opposite

Ventriduct the tip of the mandible still father, and dissect off the muscles…

... the roof of the skull should be removed with nippers. In doing this, ventriduct the head and insert one blade of the nippers into the foramen magnum…